Sync readme and client timeout changes

[ewanharris]

Description

Syncs the new client wide request timeout and docs changes across from the generator ahead of a release

References

openfga/sdk-generator#416
openfga/sdk-generator#403

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

If you haven't done so yet, we would appreciate it if you could star the OpenFGA repository. :)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.79%. Comparing base (5e61ff0) to head (76d70f4).

Files with missing lines	Patch %	Lines
openfga_sdk/configuration.py	84.61%	2 Missing ⚠️
openfga_sdk/rest.py	50.00%	1 Missing ⚠️
openfga_sdk/sync/rest.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
+ Coverage   68.77%   68.79%   +0.02%     
==========================================
  Files         124      124              
  Lines        9914     9929      +15     
==========================================
+ Hits         6818     6831      +13     
- Misses       3096     3098       +2     

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